Forgive me but I have a Mac and the I think the current Desktop Manager isn't 5.0 so I thought I would give some insight.
If you watch the 101 video from the CrackBerry home page, under
---> advanced services ---> Media Manager ---> And under step 1 it says must have BlackBerry 5.0 media player installed. Don't know how exciting this is because I never used it before but just thought I would keep you informed.
Quick heads up. 5.0 is out already. You may want to give it a try and get familiar before the Tour hits your doorstep. I'm still using DM 4.5. Works the best for me.